Question

我正在关注有关udemy的教程，但我一直坚持设置新用户。我已经设法做到最好，但是本教程使用phpmyadmin，现在我在工作台上。

谁能解释“主机匹配限制”的用途？是否仅允许访问具有特定IP地址或域名的用户？我只是在本地服务器上运行，可以为项目使用root，但是，嘿，我必须在某个阶段学习它，为什么现在不这样做？

Answer 1

严格来说，这不是MySQL Workbench的问题，但对于用户创建而言却是必不可少的：主机部分可以是主机名（由MySQL解析为IP地址）或IP地址（IPv4或IPv6）。这些值确定了用户可以从哪个主机连接，从运行MySQL服务器的主机来看（例如localhost表示MySQL服务器计算机，而不是您从其连接的计算机，除非是同一盒子）。对于每种变体，您可以使用通配符和占位符来匹配一系列计算机。

MySQL documentation的此页面描述了匹配过程并显示了示例：

The following table shows how various combinations of User and Host values in the user table apply to incoming connections.

╔═════════════╦═══════════════════════════════╦═══════════════════════════════════════════════════════════════════════════════════════════════════════════╗
║ User Value  ║          Host Value           ║                                          Permissible Connections                                          ║
╠═════════════╬═══════════════════════════════╬═══════════════════════════════════════════════════════════════════════════════════════════════════════════╣
║ 'fred'      ║ 'h1.example.net'              ║ fred, connecting from h1.example.net                                                                      ║
║ ''          ║ 'h1.example.net'              ║ Any user, connecting from h1.example.net                                                                  ║
║ 'fred'      ║ '%'                           ║ fred, connecting from any host                                                                            ║
║ ''          ║ '%'                           ║ Any user, connecting from any host                                                                        ║
║ 'fred'      ║ '%.example.net'               ║ fred, connecting from any host in the example.net domain                                                  ║
║ 'fred'      ║ 'x.example.%'                 ║ fred, connecting from x.example.net, x.example.com, x.example.edu, and so on; this is probably not useful ║
║ 'fred'      ║ '198.51.100.177'              ║ fred, connecting from the host with IP address 198.51.100.177                                             ║
║ 'fred'      ║ '198.51.100.%'                ║ fred, connecting from any host in the 198.51.100 class C subnet                                           ║
║ 'fred'      ║ '198.51.100.0/255.255.255.0'  ║ Same as previous example                                                                                  ║
╚═════════════╩═══════════════════════════════╩═══════════════════════════════════════════════════════════════════════════════════════════════════════════╝

创建新的MySQL用户：主机匹配是什么意思？

1 个答案: